Solar Autonomy Days Calculation
Solar Autonomy Days
1Load Parameters
W

Total power of luminaires + controller + other devices

h/day

Based on the lighting schedule (may include dimmed-equivalent hours)

2Battery & System Parameters
Ah
%

Lithium 80-90%, lead-acid 50-70%

%
%

Wiring loss + controller loss

3Calculation Results
days
Rainy Days Reference
Region TypeRecommended Autonomy Days
Sun-rich regions2-3 days
Cloudy regions3-5 days
Persistent rainy regions5-7 days

📋 Reference Standards

AS/NZS 4509.2Stand-Alone Power Systems
IEC 61427-2Batteries for Off-Grid PV